[Lilypond-auto] Issue 4541 in lilypond: Add Grob_interface to clean/simplify some things

[lilypond]

Status: Accepted
Owner: address@hidden
Labels: Type-Patch Patch-new

New issue 4541 by address@hidden: Add Grob_interface to  
clean/simplify some things
https://code.google.com/p/lilypond/issues/detail?id=4541

Introduce a Grob_interface class.

T::has_interface (grob) becomes has_interface<T> (grob).  (Like unsmob<T>,  
it has the advantage of not being inherited by derived classes of T.)

DECLARE_GROB_INTERFACE() is no longer required.

https://codereview.appspot.com/251700043/

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